Your amplifier is fine with this type of speaker. My friend even uses the lower power Quickie Triodes with the 988 and it is sufficient as long as you don't ask the speaker to do things it wasn't meant to do. If you consistenly listen to orchestral music at a loud level this speaker will sound strained, its the nature of the beast. The 988s excellent detail and coherence is great for baroque, chamber, light jazz & vocals like you said.
I would look into custom horn designs.
Good Luck!*>)
I would look into custom horn designs.
Good Luck!*>)